fix: set prev token in render_list_item and add block_text to ignore_blocks

[gaoflow]

When a blockquote appears inside a list item, the RST renderer's block_quote method accesses token.prev to decide whether to emit a .. separator. However, render_list_item called renderer.render_token directly without tracking prev across child tokens — unlike RSTRenderer.iter_tokens which sets prev for top-level tokens.

This meant blockquote tokens inside list items never received a prev reference. In older versions this could cause a KeyError; in the current version it silently degrades the output with missing or incorrect .. separators between blocks inside list items.

Changes:

• Track prev in render_list_item (src/mistune/renderers/_list.py), mirroring how RSTRenderer.iter_tokens sets prev for top-level tokens
• Add block_text to the ignore_blocks tuple in RSTRenderer.block_quote (src/mistune/renderers/rst.py), since block_text is the list-internal equivalent of paragraph and should be ignored when deciding whether to emit .. separators

Fixes: KeyError('prev') when rendering markdown containing blockquotes inside list items with the RST renderer

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.04%. Comparing base (90b1a73) to head (def8a6d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
+ Coverage   91.01%   91.04%   +0.03%     
==========================================
  Files          34       34              
  Lines        3395     3407      +12     
  Branches      670      672       +2     
==========================================
+ Hits         3090     3102      +12     
  Misses        184      184              
  Partials      121      121              

Flag	Coverage Δ
unittests	91.01% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[lepture]

Hi @gaoflow thanks for the patch. Can you add a test for this case?

[gaoflow]

Added in def8a6d.

The fixture now covers a list item containing normal item text followed by two separate block quotes. That case exercises both pieces of the fix: no separator before the first quote after block_text, and a .. separator before the second quote after a previous block_quote.

Local verification:

uv run --group dev python -m pytest tests/test_renderers.py -q
uv run --group dev python -m pytest -q
uv run --group dev ruff check src/mistune/renderers/_list.py src/mistune/renderers/rst.py tests/test_renderers.py
git diff --check

[lepture]

Thanks.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud